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McKee CS, Bleakley C, Rankin A, Matthews M. Outcome measures used in adolescent sport-related concussion research: a scoping review. BMJ Open 2024; 14:e075590. [PMID: 39260869 PMCID: PMC11409241 DOI: 10.1136/bmjopen-2023-075590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/13/2024] Open
Abstract
OBJECTIVES To provide an overview of the outcome measures currently used after sports-related concussion (SRC) in adolescents, categorising by the constructs they assess, follow-up duration and their feasibility of use. DESIGN Scoping review. DATA SOURCES We searched three electronic databases (MEDLINE, EMBASE and CINAHL). We also undertook citation tracking of the included articles and searched for ongoing or unpublished trials using ClinicalTrials.gov and Theses Global. ELIGIBILITY CRITERIA Studies tracking concussion recovery in adolescent athletes. RESULTS 15 782 records were identified. After initial title and abstract screening, we retrieved 87 studies for full-text screening, with 75 studies fulfilling the eligibility criteria and included in the review, comprising 13 107 participants (9480 male, 3615 female and 12 unreported), ranging in age from 5 to 19 years. 46 different outcome measures were used, with Post-Concussion Symptom Scale (n=42) and Immediate Post-Concussion Assessment and Cognitive Testing (n=21) the most common. Most outcome measures quantified aspects of sensorimotor function including balance, oculomotor function and cognition. Follow-up duration ranged from 7 days to 1 year. 60% of studies ceased follow-up assessments within 6 weeks post-SRC. CONCLUSIONS Adolescent SRC literature uses a wide range of outcome measures. Most research quantifies cognitive/fatigue domains in the acute/subacute stages post-SRC, using male participants. Other key domains such as anxiety/mood, migraine and key modifiers (cervical and sleep disturbance) are less well represented in the literature. Many of the outcome measures used in current research are associated with high cost and require highly qualified examiners, creating barriers to their implementation in some adolescent sporting environments. STUDY REGISTRATION https://doi.org/10.17605/OSF.IO/N937E.
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Affiliation(s)
| | - Chris Bleakley
- School of Health Sciences, Ulster University, Belfast, Northern Ireland
| | | | - Mark Matthews
- School of Sport, Ulster University, Belfast, Northern Ireland
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Sukiennik O, Waite P, Percy R, Orchard F. Changes to sleep patterns and insomnia symptoms following cognitive behavioural therapy for anxiety disorders in adolescents. Behav Cogn Psychother 2024; 52:522-534. [PMID: 38586945 DOI: 10.1017/s1352465824000195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
BACKGROUND It is unclear whether treatment for an anxiety disorder improves sleep. This study examined baseline sleep characteristics of adolescents with an anxiety disorder, comparing weekdays and weekends, and whether there were significant improvements in sleep following cognitive behaviour therapy (CBT). AIMS To improve our understanding of sleep problems in adolescents with an anxiety disorder and examine whether CBT for the treatment of the anxiety disorder improves sleep. METHOD Data was gathered from 179 participants with an anxiety disorder (11-17 years old) who had previously engaged with the out-patient child and adolescent mental health service. Baseline self-report measures of anxiety and depression symptoms, sleep patterns and experiences of insomnia were examined. Of this group, 135 participants had baseline data. A subset (n=73) had outcome data, which was used to examine changes in sleep following CBT. RESULTS At baseline, adolescents reported significantly less total sleep and more night-time waking on weekdays than weekends. Following treatment for their anxiety disorder, adolescents' weekday sleep patterns significantly improved for sleep onset latency and total sleep time, whereas weekend sleep patterns only showed improvements for sleep onset latency. No significant improvements were reported for symptoms of insomnia. CONCLUSIONS The study relied upon subjective measurement of sleep and there was no control group; however, the findings provide promising results that CBT for adolescent anxiety disorders can improve some sleep problems. Further research is needed to understand discrepancies between subjective and objective sleep, and to explore avenues for the delivery of support for sleep problems.
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Affiliation(s)
- Olivia Sukiennik
- Surrey and Borders Partnership NHS Foundation Trust, Mind Matters Surrey, UK
| | - Polly Waite
- School of Psychology and Clinical Language Sciences, University of Reading, Reading, UK
- Department of Experimental Psychology, University of Oxford, Oxford, UK
- Department of Psychiatry, University of Oxford, Oxford, UK
| | - Ray Percy
- School of Psychology and Clinical Language Sciences, University of Reading, Reading, UK
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Studer M, Mischler L, Romano F, Lidzba K, Bigi S. Different trajectories of post-concussive symptom subscales after pediatric mild traumatic brain injury: Data from a prospective longitudinal study. Eur J Paediatr Neurol 2024; 51:9-16. [PMID: 38744052 DOI: 10.1016/j.ejpn.2024.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 03/16/2024] [Accepted: 05/07/2024] [Indexed: 05/16/2024]
Abstract
PURPOSE The aim of this study was to investigate the trajectory of parent-rated post-concussive symptoms (PCS), attentional performance and participation within 6 months in children after mild traumatic brain injury (mTBI). METHODS For this prospective longitudinal study, we included data on 64 children after mTBI and 57 healthy control children (age 8-16 years). Parents rated PCS using the Post-Concussion Symptom Inventory (PCSI) immediately (T0), 1 week (T1), and 3-6 months after injury (T2). Attentional performance (alertness, selective and divided attention) was measured using the Test of Attentional Performance (TAP) at T1 and T2 and participation was measured using the Child and Adolescent Scale of Participation (CASP) at T2. RESULTS Friedman tests showed different trajectories of PCS subscales over time: Compared to pre-injury level, the amount of somatic and cognitive PCS was still elevated at T1, while emotional PCS at T1 were already comparable to pre-injury level. The rating of sleep-related PCS at T2 was significantly elevated compared to the pre-injury rating. Quade ANCOVAs indicated group differences in PCS subscales between patients and controls at T1, but not at T2. Patients and controls showed a similar performance in tests of attention at T1 and T2, but parental rating of participation at school was significantly reduced. Although cognitive PCS and attention were not correlated, there were significantly negative Spearman correlations between participation at home and pre-injury and concurrent PCS at T2. CONCLUSIONS Our data imply that sleep-related PCS are still elevated weeks after injury and are thus a target for interventions after mTBI.
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Affiliation(s)
- Martina Studer
- Department of Pediatric Neurology and Developmental Medicine, University Children's Hospital Basel (UKBB), Basel, Switzerland; Department of Neurology, Inselspital, Bern University Hospital, and University of Bern, Switzerland.
| | - Lara Mischler
- Division of Neuropediatrics, Development and Rehabilitation, Department of Paediatrics, Inselspital, Bern University Hospital, and University of Bern, Switzerland
| | - Fabrizio Romano
- Division of Paediatric Emergency Medicine, Department of Paediatrics, Inselspital, Bern University Hospital, and University of Bern, Switzerland
| | - Karen Lidzba
- Division of Neuropediatrics, Development and Rehabilitation, Department of Paediatrics, Inselspital, Bern University Hospital, and University of Bern, Switzerland
| | - Sandra Bigi
- Institute for Social and Preventive Medicine, University of Bern, Bern, Switzerland; Division of Pediatric Neurology, Department of Pediatrics, Children's Hospital Lucerne, Lucerne, Switzerland
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Cerri LQ, Justo MC, Clemente V, Gomes AA, Pereira AS, Marques DR. Insomnia Severity Index: A reliability generalisation meta-analysis. J Sleep Res 2023:e13835. [PMID: 36737257 DOI: 10.1111/jsr.13835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 11/22/2022] [Accepted: 01/08/2023] [Indexed: 02/05/2023]
Abstract
The aim of the current study was to conduct a reliability generalisation (RG) meta-analysis of Cronbach's alpha for the Insomnia Severity Index (ISI). A systematic search of three databases (PubMed, Scopus, and Web of Science) from inception to 12 March 2021 was performed. Publications that reported Cronbach's alpha for the total ISI score were included. Only psychometric-focussed studies were considered. Meta-analysis was carried out using a random-effects model to derive a pooled estimate of Cronbach's alphas. The number of participants in the included publications ranged from 25 to 12,056, with 33 studies (42 estimates) comprising internal consistency coefficients, and a combined sample size of N = 29,688. The age range of the included publications was from 13.4 to 74.3 years. Data extraction implied 33 publications out of 706 found through the database search. Cronbach's alphas ranged from 0.65 to 0.92. The majority of the reported coefficients were ≥0.7 and presented a low risk of bias (n = 32). The pooled alpha coefficient was 0.83 (IC [0.81-0.85]; SE = 0.009) with high heterogeneity among the included publications (I2 = 97%). Subgroup analyses including moderators such as continent, setting, risk of bias, and age did not affect significantly the overall result. In general, the cumulative estimate of Cronbach's alpha for the ISI is good. However, this finding should be interpreted with caution since there is a high heterogeneity level and some of the studies might not have checked the assumptions underlying Cronbach's alphas.
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Affiliation(s)
- Luíza Quinália Cerri
- Department of Education and Psychology, Campus Universitário de Santiago, University of Aveiro, Aveiro, Portugal
| | - Mariana Carvalho Justo
- Department of Education and Psychology, Campus Universitário de Santiago, University of Aveiro, Aveiro, Portugal
| | - Vanda Clemente
- Sleep Medicine Centre, Coimbra University Hospital Centre (CHUC), Coimbra, Portugal.,CINEICC - Center for Research in Neuropsychology and Cognitive Behavioral Intervention, Faculty of Psychology and Educational Sciences, University of Coimbra, Coimbra, Portugal
| | - Ana Allen Gomes
- CINEICC - Center for Research in Neuropsychology and Cognitive Behavioral Intervention, Faculty of Psychology and Educational Sciences, University of Coimbra, Coimbra, Portugal.,Faculty of Psychology and Educational Sciences, University of Coimbra, Coimbra, Portugal
| | - Anabela Sousa Pereira
- Department of Psychology, Colégio Pedro da Fonseca, Rua da Barba Rala, University of Évora, Évora, Portugal.,Center for Research in Education and Psychology (CIEP), University of Évora, Evora, Portugal.,William James Center for Research - WJCR/UA, Aveiro, Portugal
| | - Daniel Ruivo Marques
- Department of Education and Psychology, Campus Universitário de Santiago, University of Aveiro, Aveiro, Portugal.,CINEICC - Center for Research in Neuropsychology and Cognitive Behavioral Intervention, Faculty of Psychology and Educational Sciences, University of Coimbra, Coimbra, Portugal
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Djukic S, Phillips NL, Lah S. Sleep outcomes in pediatric mild traumatic brain injury: a systematic review and meta-analysis of prevalence and contributing factors. Brain Inj 2022; 36:1289-1322. [PMID: 36413091 DOI: 10.1080/02699052.2022.2140198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVE The aim was to determine the prevalence of disturbed sleep in children who sustained mild traumatic brain injury (mTBI). METHODS We conducted electronic searches of three databases MEDLINE, PsychINFO and EMBASE against pre-determined inclusion/exclusion criteria. We used the Newcastle-Ottawa Scale to assess the risk of bias. RESULTS Forty-four articles met the inclusion criteria. The risk of bias was mainly rated as moderate to high. Meta-analysis revealed that prevalence of sleep disturbances decreased as the time since injury increased: 51%, 40% and 9% within 1 week, between 1 week and 1 month, and between 1 and 3 months, respectively, but increased to 21% after 3 months. The sleep symptom drowsiness followed a similar temporal pattern. Other sleep symptoms of hypersomnia (sleeping more than usual) and insomnia (trouble falling asleep and sleeping less than usual) remained stable over time. The prevalence of sleep disturbances in children with mTBI was higher than in the general population. Pre-injury sleep and older age at injury were related to worse sleep outcomes. CONCLUSIONS Sleep disturbances are highly prevalent in the acute phase post-mTBI. Given that disturbed sleep can impact daily functioning and recovery, routine screening and management of sleep disturbances in children who sustain mTBI is important.
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Affiliation(s)
- Suzana Djukic
- School of Psychology, The University of Sydney, Sydney, Australia
| | | | - Suncica Lah
- School of Psychology, The University of Sydney, Sydney, Australia
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The Nocebo Effect and Pediatric Concussion. J Sport Rehabil 2021; 30:837-843. [PMID: 34050035 DOI: 10.1123/jsr.2020-0519] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/01/2021] [Accepted: 03/24/2021] [Indexed: 12/16/2022]
Abstract
While placebo effects are well recognized within clinical medicine, "nocebo effects" have received much less attention. Nocebo effects are problems caused by negative expectations derived from information or treatment provided during a clinical interaction. In this review, we examine how nocebo effects may arise following pediatric concussion and how they may worsen symptoms or prolong recovery. We offer several suggestions to prevent, lessen, or eliminate such effects. We provide recommendations for clinicians in the following areas: terminology selection, explicit and implicit messaging to patients, evidence-based recommendations, and awareness of potential biases during clinical interactions. Clinicians should consider the empirically grounded suggestions when approaching the care of pediatric patients with concussion.
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Raikes AC, Dailey NS, Forbeck B, Alkozei A, Killgore WDS. Daily Morning Blue Light Therapy for Post-mTBI Sleep Disruption: Effects on Brain Structure and Function. Front Neurol 2021; 12:625431. [PMID: 33633674 PMCID: PMC7901882 DOI: 10.3389/fneur.2021.625431] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 01/15/2021] [Indexed: 12/11/2022] Open
Abstract
Background: Mild traumatic brain injuries (mTBIs) are associated with novel or worsened sleep disruption. Several studies indicate that daily morning blue light therapy (BLT) is effective for reducing post-mTBI daytime sleepiness and fatigue. Studies demonstrating changes in brain structure and function following BLT are limited. The present study's purpose is to identify the effect of daily morning BLT on brain structure and functional connectivity and the association between these changes and self-reported change in post-mTBI daytime sleepiness. Methods: A total of 62 individuals recovering from a mTBI were recruited from two US cities to participate in a double-blind placebo-controlled trial. Eligible individuals were randomly assigned to undergo 6 weeks of 30 min daily morning blue or placebo amber light therapy (ALT). Prior to and following treatment all individuals completed a comprehensive battery that included the Epworth Sleepiness Scale as a measure of self-reported daytime sleepiness. All individuals underwent a multimodal neuroimaging battery that included anatomical and resting-state functional magnetic resonance imaging. Atlas-based regional change in gray matter volume (GMV) and region-to-region functional connectivity from baseline to post-treatment were the primary endpoints for this study. Results: After adjusting for pre-treatment GMV, individuals receiving BLT had greater GMV than those receiving amber light in 15 regions of interest, including the right thalamus and bilateral prefrontal and orbitofrontal cortices. Improved daytime sleepiness was associated with greater GMV in 74 ROIs, covering many of the same general regions. Likewise, BLT was associated with increased functional connectivity between the thalamus and both prefrontal and orbitofrontal cortices. Improved daytime sleepiness was associated with increased functional connectivity between attention and cognitive control networks as well as decreased connectivity between visual, motor, and attention networks (all FDR corrected p < 0.05). Conclusions: Following daily morning BLT, moderate to large increases in both gray matter volume and functional connectivity were observed in areas and networks previously associated with both sleep regulation and daytime cognitive function, alertness, and attention. Additionally, these findings were associated with improvements in self-reported daytime sleepiness. Further work is needed to identify the personal characteristics that may selectively identify individuals recovering from a mTBI for whom BLT may be optimally beneficial.
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Affiliation(s)
- Adam C Raikes
- Center for Innovation in Brain Science, University of Arizona, Tucson, AZ, United States
| | - Natalie S Dailey
- Social, Cognitive, and Affective Neuroscience Lab, University of Arizona, Tucson, AZ, United States
| | - Brittany Forbeck
- Social, Cognitive, and Affective Neuroscience Lab, University of Arizona, Tucson, AZ, United States
| | - Anna Alkozei
- Social, Cognitive, and Affective Neuroscience Lab, University of Arizona, Tucson, AZ, United States
| | - William D S Killgore
- Social, Cognitive, and Affective Neuroscience Lab, University of Arizona, Tucson, AZ, United States
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Macartney G, Woodfield M, Terekhov I, Vassilyadi M, Goulet K. Anxiety, depression, and symptom experience in concussed children and youth. J SPEC PEDIATR NURS 2021; 26:e12310. [PMID: 32965082 DOI: 10.1111/jspn.12310] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 08/18/2020] [Accepted: 09/08/2020] [Indexed: 11/28/2022]
Abstract
PURPOSE To describe and explore the relationship between baseline anxiety, depression and symptom experience in children and youth assessed at a concussion clinic. DESIGN AND METHODS A retrospective chart review of concussed children and youth referred to a pediatric teaching hospital concussion clinic over a 15-month period was completed. Kutcher Adolescent Depression Scale (KAD-6), General Anxiety Disorder Scale (GAD-7), and the Post-Concussion Symptom Inventory (PCSI) scores were extracted. RESULTS A total of 155 patients were included. The most common symptoms (PCSI) at baseline were headache, fatigue, and feelings of head pressure. Symptoms were rated as mild to moderate in intensity. Overall, mean depression and anxiety scores were low. The mean anxiety scores, as measured by the GAD-7 (n = 108), was 7.4 (range, 0-24). The mean depression score, as measured by the KAD-6 (n = 94), was 4.7 (range, 0-18). A statistically significant, moderate positive correlation between PCSI scores with KAD-6 scores for male (r = .64, p < .001) and female (r = .61, p < .001) participants was identified. Similarly, a statistically significant, moderate positive correlation between PCSI scores with GAD-7 scores for male (r = .68, p < .001) and female (r = .60, p < .001) participants was identified. PRACTICE IMPLICATIONS Concussed children may experience a wide array of symptoms, including emotional challenges such as anxiety and depression. Feelings of anxiety and depression may contribute to overall post concussive symptoms in concussed children. The electronic health record can be leveraged to provide important patient data. Clinicians should systematically assess symptoms at each visit in concussed children and youth so that appropriate interventions can be implemented and monitored.
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Affiliation(s)
- Gail Macartney
- Faculty of Nursing, The University of Prince Edward Island, Charlottetown, Canada
| | | | - Ivan Terekhov
- The Children's Hospital of Eastern Ontario, Ottawa, Canada
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Barlow KM, Kirk V, Brooks B, Esser MJ, Yeates KO, Zemek R, Kirton A, Mikrogianakis A, MacMaster F, Nettel-Aguirre A, Hutchison J, Turley B, Cameron C, Hill M, Boyd R, Dewey D. Efficacy of Melatonin for Sleep Disturbance in Children with Persistent Post-Concussion Symptoms: Secondary Analysis of a Randomized Controlled Trial. J Neurotrauma 2020; 38:950-959. [PMID: 32988292 DOI: 10.1089/neu.2020.7154] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Sleep disturbances are commonly reported in children with persistent post-concussion symptoms (PPCS). Melatonin treatment is often recommended, yet supporting evidence is scarce. We aimed to evaluate the efficacy of treatment with melatonin for sleep disturbance in youth with PPCS following mild traumatic brain injury (mTBI). This article is a secondary analysis of a clinical trial of melatonin compared with placebo to treat PPCS. Youth (8-18 years of age) with PPCS and significant sleep-related problems (SRPs) at 4-6 weeks post-injury were eligible. Exclusion criteria: significant medical/psychiatric history; previous concussion/mTBI within 3 months. Treatment groups were: placebo, melatonin 3 mg, or melatonin 10 mg. Primary outcome was change in SRPs measured using the Post-Concussion Symptom Inventory (PCSI) after 2 weeks of treatment. Secondary outcomes included change in actigraphy sleep efficiency, duration, onset latency, and wake-after-sleep-onset. Behavior was measured using Behaviour Assessment for Children (2nd edition). Seventy-two participants (mean age 14.0, standard deviation [SD] = 2.6) years; 60% female) with PPCS and significant sleep disturbance were included in the secondary analysis: placebo (n = 22); melatonin 3 mg (n = 25); melatonin 10 mg (n = 25). Sixty-four participants had actigraphy data. SRPs decreased across all groups over time with a significant effect of melatonin 3 mg (3.7; 95% confidence interval [CI]: 2.1, 5.4) compared with placebo (7.4; 95% CI: 4.2, 10.6) and melatonin 10 mg (6.4; 95% CI: 3.6, 9.2). Sleep duration increased in the melatonin 3 mg (43 min; 95% CI: 6, 93) and melatonin 10 mg groups (55 min; 95% CI: 5, 104) compared with placebo. A per protocol analysis demonstrated improved sleep efficiency in the melatonin 10 mg group (p = 0.029). No serious adverse events were reported. Depressive symptoms significantly decreased with melatonin 3 mg (-4.7; 95% CI: -9.2, -.2) but not with melatonin 10 mg (-1.4, 95% CI: -5.9, 3.2) treatment compared with placebo. Changes in cognition or behavior were otherwise not significantly different between treatment groups. Short-term melatonin is a well-tolerated treatment for sleep disturbance in youth with PPCS following mTBI. In this context, it may also be associated with a reduction in depressive symptoms.
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Affiliation(s)
- Karen Maria Barlow
- Child Health Research Centre, University of Queensland Faculty of Medicine and Biomedical Sciences, South Brisbane, Queensland, Australia.,Department of Paediatrics, University of Calgary Cumming School of Medicine, Calgary, Alberta, Canada
| | - Valerie Kirk
- Department of Paediatrics, University of Calgary Cumming School of Medicine, Calgary, Alberta, Canada
| | - Brian Brooks
- Department of Pediatrics, Clinical Neurosciences, and Psychology, Alberta Children's Hospital and University of Calgary, Calgary, Alberta, Canada
| | | | - Keith Owen Yeates
- Department of Psychology and University of Calgary, Calgary, Alberta, Canada
| | - Roger Zemek
- Clinical Research Unit, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - Adam Kirton
- Department of Paediatrics, University of Calgary Cumming School of Medicine, Calgary, Alberta, Canada
| | | | - Frank MacMaster
- Department of Psychiatry and Pediatrics, University of Calgary, Calgary, Alberta, Canada
| | - Alberto Nettel-Aguirre
- Department of Paediatrics, University of Calgary Cumming School of Medicine, Calgary, Alberta, Canada
| | - James Hutchison
- Critical Care Medicine and Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Brenda Turley
- Department of Pediatrics, Clinical Neurosciences, and Psychology, Alberta Children's Hospital and University of Calgary, Calgary, Alberta, Canada
| | - Candice Cameron
- Research Pharmacy, Alberta Health Services, Calgary, Alberta, Canada
| | - Michael Hill
- Department of Clinical Neurosciences, University of Calgary Cumming School of Medicine, Calgary, Alberta, Canada
| | - Roslyn Boyd
- Children's Health Research Centre, University of Queensland, South Brisbane, Queensland, Australia
| | - Deborah Dewey
- Department of Paediatrics, University of Calgary Cumming School of Medicine, Calgary, Alberta, Canada
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